Anionic polymer products and processes
US5985992A · kind A · utility
46Cited by
20References
46Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Dec 10, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A20/212
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Aqueous dispersions of anionic water-soluble or water-swellable polymers are provided, where the polymers have an anionic charge of greater than 16% and where the dispersions maintain their form at a pH of 5.1 or greater. Processes for making these dispersions are also disclosed, as well as methods of using these dispersions to treat water containing various types of suspended materials. Dry polymers, preferably formed by drying these aqueous dispersions, are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.